Disclosed is a composite electroplating method for sintered NdFeB magnet, including: a process of pre-treating sintered NdFeB magnet, a process of electroplating the pre-treated sintered NdFeB magnet, and a process of cleaning and drying the electroplated sintered NdFeB magnet. The electroplating process forms a composite coating composed of a Zn coating, a Zn—Ni alloy coating, a Cu coating and a Ni coating on the surface of the sintered NdFeB magnet.